This is lecture 1 of [[Stephen Hicks]]'s [[PA Logic]] course at [[Peterson Academy]]. Logical Puzzles: - "Who should I shoot first?" Three way gun duel with varying probabilities - Islander "Bal" and "Dal" to "Yes" and "No" correspondence An argument is made up of a conclusion and one or more premises. Premise indicators: - Because, - Since, - For the reasons that, - For, Conclusion indicators: - So, An enthymeme is an incomplete argument with missing premises or the conclusion. ## Evaluating Arguments Two dimensions by which we evaluate arguments is with respect to their truth and their validity. - Valid = An argument is structurally/formally correct. The conclusion logically follows from the premises. - Truth = The information used as premises correspond to reality. Back to: [[PA Logic]] Next: [[Concepts & Our Cognitive Hierarchy]]